渐扩进料体旋流器的数值模拟与PIV测试

Numerical Simulation and PIV Test of the Hydrocyclone with Conical Feed Part

为了深入探究渐扩进料体旋流器内部的流场特征,采用数值模拟和激光粒子图像测速(PIV)技术相结合的方法对Φ40 mm渐扩进料体旋流器内的流体速度分布和空气柱形成过程进行研究。结果表明,溢流管附近流体的轴向速度较大,零速包络面特征表明在靠近溢流管的零点轨迹明显减少,流体快速向下运动,有助于短路流进入外旋流参与分离过程,减少直接进入到溢流管的短路流量,有利于减少短路流、提高分离效率。数值模拟与PIV测试吻合程度较高,验证了模拟的准确性。

In order to investigate the characteristics of the flow field in the hydrocyclone with conical feed part,The fluid velocity distribution and air column formation process in Φ40mm hydrocyclone with conical feed part were studied by numerical simulation and laser particle image velocimetry（PIV） technique. The results showed that the axial velocity of the fluid near the overflow tube was larger, the zero point trajectory near the overflow pipe was obviously reduced according to the zero velocity envelope surface characteristics and the fluid moved downward rapidly. It was helpful for the short circuit flow to enter the external swirl and participate in the separation process; reduce the amount of short circuit flow and improve the separation efficiency. The numerical simulation was in good agreement with the PIV test, which verified the accuracy of the simulation.